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Telegram/lib_ui/ui/effects/panel_animation.h

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+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#pragma once
+
+#include "styles/style_widgets.h"
+
+namespace Ui {
+
+class RoundShadowAnimation {
+public:
+	void setCornerMasks(const std::array<QImage, 4> &corners);
+
+protected:
+	void start(int frameWidth, int frameHeight, float64 devicePixelRatio);
+	void setShadow(const style::Shadow &st);
+
+	bool started() const {
+		return !_frame.isNull();
+	}
+
+	struct Corner {
+		QImage image;
+		int width = 0;
+		int height = 0;
+		const uchar *bytes = nullptr;
+		int bytesPerPixel = 0;
+		int bytesPerLineAdded = 0;
+
+		bool valid() const {
+			return !image.isNull();
+		}
+	};
+	void setCornerMask(Corner &corner, const QImage &image);
+	void paintCorner(Corner &corner, int left, int top);
+
+	struct Shadow {
+		style::margins extend;
+		QImage left, topLeft, top, topRight, right, bottomRight, bottom, bottomLeft;
+
+		bool valid() const {
+			return !left.isNull();
+		}
+	};
+	QImage cloneImage(const style::icon &source);
+	void paintShadow(int left, int top, int right, int bottom);
+	void paintShadowCorner(int left, int top, const QImage &image);
+	void paintShadowVertical(int left, int top, int bottom, const QImage &image);
+	void paintShadowHorizontal(int left, int right, int top, const QImage &image);
+
+	Shadow _shadow;
+
+	Corner _topLeft;
+	Corner _topRight;
+	Corner _bottomLeft;
+	Corner _bottomRight;
+
+	QImage _frame;
+	uint32 *_frameInts = nullptr;
+	int _frameWidth = 0;
+	int _frameHeight = 0;
+	int _frameAlpha = 0; // recounted each getFrame()
+	int _frameIntsPerLine = 0;
+	int _frameIntsPerLineAdded = 0;
+
+};
+
+class PanelAnimation : public RoundShadowAnimation {
+public:
+	enum class Origin {
+		TopLeft,
+		TopRight,
+		BottomLeft,
+		BottomRight,
+	};
+	PanelAnimation(const style::PanelAnimation &st, Origin origin) : _st(st), _origin(origin) {
+	}
+
+	struct PaintState {
+		float64 opacity = 0.;
+		float64 widthProgress = 0.;
+		float64 heightProgress = 0.;
+		float64 fade = 0.;
+		int width = 0;
+		int height = 0;
+	};
+
+	void setFinalImage(QImage &&finalImage, QRect inner);
+	void setSkipShadow(bool skipShadow);
+
+	void start();
+	[[nodiscard]] PaintState computeState(float64 dt, float64 opacity) const;
+	PaintState paintFrame(
+		QPainter &p,
+		int x,
+		int y,
+		int outerWidth,
+		float64 dt,
+		float64 opacity);
+
+private:
+	void setStartWidth();
+	void setStartHeight();
+	void setStartAlpha();
+	void setStartFadeTop();
+	void createFadeMask();
+	void setWidthDuration();
+	void setHeightDuration();
+	void setAlphaDuration();
+
+	const style::PanelAnimation &_st;
+	Origin _origin = Origin::TopLeft;
+
+	QPixmap _finalImage;
+	int _finalWidth = 0;
+	int _finalHeight = 0;
+	int _finalInnerLeft = 0;
+	int _finalInnerTop = 0;
+	int _finalInnerRight = 0;
+	int _finalInnerBottom = 0;
+	int _finalInnerWidth = 0;
+	int _finalInnerHeight = 0;
+
+	bool _skipShadow = false;
+	int _startWidth = -1;
+	int _startHeight = -1;
+	int _startAlpha = 0;
+
+	int _startFadeTop = 0;
+	QPixmap _fadeMask;
+	int _fadeHeight = 0;
+	QBrush _fadeFirst, _fadeLast;
+
+	float64 _widthDuration = 1.;
+	float64 _heightDuration = 1.;
+	float64 _alphaDuration = 1.;
+
+};
+
+} // namespace Ui